Gravitational waveforms for spinning compact binaries

The rotation of the bodies and the eccentricity of the orbit have significant effects on the emitted gravitational radiation of binary systems. This work focuses on the evaluation of the gravitational wave polarization states for spinning compact binaries. We consider binaries on eccentric orbits and the spin-orbit interaction up to the 1.5 post-Newtonian order in a way which is independent of the parameterization of the orbit. The equations of motion for angular variables are included. The formal expressions of the polarization states are given with the inclusion of higher order corrections to the waveform

Lissajous curves with a finite sum of prime number frequencies

The Ulam spiral inspired us to calculate and present Lissajous curves where the orthogonally added functions are a finite sum of sinus and cosines functions with consecutive prime number frequencies.Comment: 5 pages and 4 figure

Gravitational waves from binaries on unbound orbits

A generalized true anomaly-type parametrization, convenient to describe both bound and open orbits of a two-body system in general relativity is introduced. A complete description of the time evolution of both the radial and of the angular equations of a binary system taking into account the first order post-newtonian (1PN) is given. The gravitational radiation field emitted by the system is computed in the 1PN approximation including higher multipole moments beyond the standard quadrupole term. The gravitational waveforms in the time domain are explicitly given up to the 1PN order for unbound orbits, but the results are also illustrated on binaries on elliptic orbits with special attention given to the effects of eccentricity.Comment: 27 pages, 10 figures, to appear in Phys. Rev.

A multibaker map for shear flow and viscous heating

A consistent description of shear flow and the accompanied viscous heating as well the associated entropy balance is given in the framework of a deterministic dynamical system. A laminar shear flow is modeled by a Hamiltonian multibaker map which drives velocity and temperature fields. In an appropriate macroscopic limit one recovers the Navier-Stokes and heat conduction equations along with the associated entropy balance. This indicates that results of nonequilibrium thermodynamics can be described by means of an abstract, sufficiently chaotic and mixing dynamics. A thermostating algorithm can also be incorporated into this framework.Comment: 11 pages; RevTex with multicol+graphicx packages; eps-figure

An analytic approach to the late ISW effect in a Lambda dominated universe

The integrated Sachs-Wolfe (ISW) effect in a Lambda dominated universe can be an important factor in the evolution of cosmic microwave background fluctuations. With the inclusion of cosmological constant we present the complete analytic solution of the covariant linear perturbations of the Einstein equations in the Newtonian gauge, in the case of a spatially flat (K=0), Friedman-Robertson-Walker (FRW) universe, filled with pressureless ideal fluid. We use the analytic time dependence of the perturbation potentials to derive the anisotropy power spectrum of the late ISW effect. We choose the scale invariant Harrison-Zeldovich spectrum for obtaining the C_l momenta and show the agreement of our results with earlier, numeric calculations.Comment: 10 pages, 1 figur

Etán-etilén kolonna vizsgálata és optimalizálása

Az etán-etilén szétválasztás a vegyipari benzin feldolgozása során az egyik jelentős feladat. A szeparációhoz nagy mennyiségű hideg és meleg energia szükséges, ezért az energiafelhasználás csökkentésének lehetősége manapság is aktívan kutatott terület. Jelen cikk témája egy adott tányérszámú etán-etilén kolonna vizsgálata folyamat szimulációs szoftverrel. A vizsgálatnak két fő célja van, adott mennyiségű betáp mellett a maximális fejtermék biztosítása és a folyamat lefutásához szükséges energiamennyiség minimalizálása. A rendszer energiaszükséglete meghatározható a kiforraló, a kondenzátor és a betáp hőáramának összegével

Scots pine (Pinus sylvestris)

Technical guidelines are targeted to practical forest managers and provide summarized information on the biology and ecology of tree species, distribution ranges, importance and use, genetic knowledge, threats to genetic diversity and recommendations for long-term genetic conservation. For the full list of Technical guidelines produced, please visit http://www.euforgen.org/publications/technical_guidelines.htm